@jfmgraywrote:sometimes we can miss out on repeat buyers by treating all buyers like bad buyers.
How is not leaving feedback upon payment treating someone like a bad buyer, though? To me that's making a few too many presumptions about the motivations behind someone else's decisions, and still plays into the suggestion that buyers are owed positive feedback and sellers are just withholding it in a "wait and see" scenario if they don't leave it on payment. There's nothing outward that should suggest that, and it's also a bit like thinking when I go into a store and see a big sign up saying something like "Shoplifters will be prosecuted", automatically assuming they think all customers are thieves... 
As we can see from a few posts in this thread, FB for buyers is interpreted in a few different ways - eg it's meaningless [likely because so many people do leave it upon payment, which is the bare minimum amount of participation a buyer needs to have in a transaction], or it's a way of saying thanks, but both of those are subjective viewpoints and neither relate to what feedback is (or was) intended for in the strictest sense (i.e. it's an evaluation of a transaction, and how can one properly evaluate a transaction until the transaction is concluded, which doesn't happen until after the buyer receives an item and there needs to be no further input from either party. That doesn't have to mean the seller is waiting just in case the buyer turns out to be a jerk, maybe they actually just place a higher value on FB and want it to be more than a "thanks for the cash" kind of insta-comment). I get that there's not much more you can say beyond that in a lot of transactions, but the potential is there if sellers wait.
As always, for full disclosure, I leave FB manually after payment but before postage*, and don't much care if or when a seller leaves it for me as a buyer, so it's not like I'm arguing for the practices I personally engage in.
* purely because I absolutely loathe being asked for feedback. It doesn't eliminate it, either, as some people still send messages asking for it even though I already left it days ago. Ergo, (and I'm not ashamed to admit this) some also view FB upon payment as a token gesture that placates above anything else. I will leave personalised comments for people I know or regulars, or those I've worked with closely on custom orders (if I picked up on their purchase when leaving FB, since I do it in bulk), but by and large I leave it first because I just don't want to be bothered with "where's me feedback, mate?" BS.
